BOB°ëµº

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buzz a soft, low hum. [1/4 definitions]
dial tone the steady hum or buzzing sound in a telephone receiver showing that the line is open and a number may be dialed or entered.
drone2 to make a low, steady hum. [2/3 definitions]
hum When you hum, you make the sound of a song without opening your mouth or lips. [2/4 definitions]